//String对象
//创建字符串
var str = 'he\tllo\' \n world\\';
console.log(str);
var city = String('福州');
//创建一个字符对象
var country = new String('China');
console.log(country);
//字符转换成大写/小写
var str2 = 'BeiJiNg';
console.log(str2.toLowerCase());//小写
console.log(str2.toUpperCase());//大写
console.log(country.toUpperCase());
//--10:15





